来大神看看为啥上传图片不能用

[realdrizzt]

这是控制器：

function partadd_action(){
		if($_GET['id']){
			$row=$this->obj->DB_select_once("partjob","`uid`='".$this->uid."' and `id`='".(int)$_GET['id']."'");
			if($row['worktime']!=""){
				$worktime=@explode(",",$row['worktime']);
				foreach($worktime as $k=>$v){
					$arr=@explode(":",$v);
					$arrs=@explode("到",$arr[1]);
					$html.='<div class="part_hour" id="handletime_'.$k.'"><input type="hidden" name="worktime[]" value="'.$v.'"><span>时间段'.$v.'</span><em><a href="javascript:Save_time(\''.$k.'\',\''.$arr[0].'\',\''.$arrs[0].'\',\''.$arrs[1].'\',\''.$arr[2].'\');">修改</a><a href="javascript:Delete_time(\''.$k.'\');">删除</a></em></div>';
				}
				$this->yunset("worktime",$html);
			}
			$this->yunset("row",$row);
		}
		
		$TinyM=$this->MODEL('part');
		
		if($_POST['submit']){
			if($_POST['worktime']){
				$_POST['worktime']=@implode(",",$_POST['worktime']);
			}
			$_POST['content']=str_replace(array("&","background-color:#ffffff","background-color:#fff","white-space:nowrap;"),array("&",'background-color:','background-color:','white-space:'),html_entity_decode($_POST['content'],ENT_QUOTES,"GB2312"));			
			$_POST['sdate']=strtotime($_POST['sdate']);
			if($_POST['timetype']||$_POST['edate']==''){
				$_POST['edate']="";
			}else{
				$_POST['edate']=strtotime($_POST['edate']);
			}
			$_POST['deadline']=strtotime($_POST['deadline']);
			$_POST['lastupdate'] = time();
			$_POST['state'] = $this->config['com_partjob_status'];	
			$id=(int)$_POST['id'];
			//图片
			if(is_uploaded_file($_FILES['pic']['tmp_name'])){
				$upload=$this->upload_pic("../data/upload/partjob/",false);
				$pictures=$upload->picture($_FILES['pic']);
				$pic=str_replace("../data/upload/partjob/","data/upload/partjob/",$pictures);
				$_POST['pic']=$pic;
			}
			unset($_POST['submit']);
			unset($_POST['id']);
			if(!$id){
				$_POST['addtime'] = time();
				$_POST['uid'] = $this->uid;
				$data['msg']=$this->get_com(7);
				
				if($data['msg']==''){
					$company=$this->obj->DB_select_once("company","`uid`='".$this->uid."'");
					$_POST['com_name']=$company['name'];
					$nid=$this->obj->insert_into("partjob",$_POST);
					$name="添加活动";
					if($nid){
						$state_content = "新发布了活动 <a href=\"".$this->config['sy_weburl']."/part/index.php?c=show&id=$nid\" target=\"_blank\">".$_POST['name']."</a>。";
						$this->addstate($state_content,2);
						$nid?$data['msg']=$name."成功！":$data['msg']=$name."失败！";
					}
				}
			}else{
				$arr=$TinyM->GetPartjobOne(array('id'=>$id,'password'=>$password),array('field'=>'pic,id'));
				if($arr['id']){
					//图片
					if ($_POST['pic']!=''){
				        $data['pic']=$_POST['pic'];
				    }else{
				        $data['pic']=$arr['pic'];
				    }
				}
				$job=$this->obj->DB_select_once("partjob","`id`='".$id."' and `uid`='".$this->uid."'","state");
				if($job['state']=="1" || $job['state']=="2"){
					$data['msg']=$this->get_com(8);
				}
				
				if($data['msg']==''){
					$where['id']=$id;
					$where['uid']=$this->uid;
					$nid=$this->obj->update_once("partjob",$_POST,$where);
					$name="更新活动";
					$nid?$data['msg']=$name."成功！":$data['msg']=$name."失败！";
				}
			}

			$data['url']='index.php?c=part';
		}
		$this->rightinfo();
		$this->yunset("layer",$data);
		$this->yunset($this->MODEL('cache')->GetCache(array('city','part')));
		$hour=array("00","01","02","03","04","05","06","07","08","09","10","11","12","13","14","15","16","17","18","19","20","21","22","23","24");
		$minute=array("00","10","20","30","40","50");
		$this->yunset("hour",$hour);
		$this->yunset("minute",$minute);
		$this->yunset("today",date("Y-m-d"));
		$this->waptpl('partadd');
	}

这是前端代码：

		<dl class="resume-cont_wate_list" >
          <dt>活动图片<span class="x_cor"> </span></dt>
          <dd>
            <div class="once_cont_wate_list_photo">
              <input type="file" id="pic" name="pic" value="{yun:}$row.pic{/yun}" class="yun_wap_addresume_text">
            </div>
            {yun:}if $row.pic{/yun} <img src="{yun:}$config.sy_weburl{/yun}/{yun:}$row.pic{/yun}" width="145" height="35"> {yun:}/if{/yun} 
		  </dd>
        </dl>